Red Sea

RSK 300 Reefer Internal Protein Skimmer

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Protein Skimming Reinvented 

Efficient  |  Quiet  |  Ergonomic


Red Sea Recommends for tanks up to:

Light Bioload - 225 gallons

Medium Bioload - 150 gallons

Heavy Bioload (most common) - 75 gallons


Red Sea Reefer Internal Protein Skimmers are designed with the hobbyist needs in mind. From quiet rubber feet, a robust air silencer, and not to mention the FoamView window with built a built-in manual neck cleaner, all which are focused towards easier maintenance along with a quieter reef tank. Starting at the top, Red Sea's Reefer Skimmers now include a built-in neck cleaner that can be manually turned to remove any build-up from the walls of the neck, while the integrated FoamView window lets you see how the foam is collecting in the neck. Along with the included cup-drain tube, emptying the collection cup is only requires a turn of a valve, and is also super easy to connect to an external waste collector. Moving down, every Red Sea Reefer Skimmer includes a Sicce PSK pump for enhanced performance and reliability that pushes a balanced amount of air and water through the hydrodynamically efficient bubble diffuser setting them up for a turbulent free ride into the collection cup. 

  • Integrated Manual Neck Cleaner
  • High Flow Air Silencer
  • Simple to Maintain and Disassemble
  • Easy to Tune Water Level Control
  • Vibration Reducing Feet and Connectors
  • Includes Collection Cup Drain Line & Valve
  • Multiple Pump Orientations for Sumps with Tight Spaces



Footprint* - 9.1" x 8.3" or 9.8" x 7.1"

Height - 21"

Recommended Water Height - 6" - 8"

Air Flow - 500 LPH (130 GPH)

Water Flow - 1000 LPH (265 GPH) 


*Footprint can be changed depending on the pumps orientation inside of the skimmer body


What's Included?

1x RSK 300 Reefer Protein Skimmer Body

1x RSK 300 Reefer Collection Cup with Neck Cleaner

1 Meter RSK 300 Reefer Drain Hose with Valve

1x RSK 300 Reefer Air Silencer with Pump Feed Hose

1x Sicce PSK Pump


More Information
UPC 730773505036

Owners Manual Owners Manual

Skimmer Type In-Sump / Internal
Capacity Light Bioload - Up to 225 Gallons
Medium Bioload - Up to 150 Gallons
Heavy Bioload - Up to 75 Gallons
Dimensions 9.1"L x 8.3"W x 21"H or 9.8"L x 7.1"W x 21"H*
Rec. Water Level 6" - 8"
Air Draw 500 LPH
Flow Rate 265 GPH
Pump Model Sicce PSK 600
Pump Rotor Type Needlewheel
Variable Speed No
Power Type AC
Power Consumption 12 Watts
Power Cord Length 7 Feet
Additional Notes *Footprint can be changed depending on the pump's orientation inside of the skimmer body
Pump Included Yes
Gallons Per Hour 100 - 300 GPH
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Product Questions

Would this skimmer fit in ruby sump 30?
Question by: Cong Nguyen on Mar 9, 2020, 8:36 PM
Hi there,

Yes it would fit, the skimmer is 9.1"x8.3" and the sump has a space of 11"x13.5".

Take care
Answer by: Thomas Billington on Mar 11, 2020, 2:36 PM
Would this skimmer be over kill for a reefer 250?
Question by: Patrick Elisha on Jun 26, 2019, 11:47 PM
Hey! Great question :) This skimmer is rated for a 75g with a heavy bio-load all the way to a 225g with a light bio-load and would absolutely work with your Reefer 250. One of the most important things to check when purchasing a skimmer is if it will fit in your sump/skimmer chamber? The Reefer 250 has a skimmer chamber of 13.8"x9.8" and will absolutely fit the RSK 300 with its footprint of 9.1"x8.3". I think this is a great choice!
Answer by: Ash on Jun 27, 2019, 11:05 AM